EP1504835B1 - Gas feed pipe connecting screw for continuous casting nozzle - Google Patents

Gas feed pipe connecting screw for continuous casting nozzle Download PDF

Info

Publication number
EP1504835B1
EP1504835B1 EP04018284A EP04018284A EP1504835B1 EP 1504835 B1 EP1504835 B1 EP 1504835B1 EP 04018284 A EP04018284 A EP 04018284A EP 04018284 A EP04018284 A EP 04018284A EP 1504835 B1 EP1504835 B1 EP 1504835B1
Authority
EP
European Patent Office
Prior art keywords
screw
gas feed
continuous casting
nozzle
mounting hole
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP04018284A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1504835A1 (en
Inventor
Syojiro Naito
Kazuhide Uchida
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Akechi Ceramics Co Ltd
Original Assignee
Akechi Ceramics Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Akechi Ceramics Co Ltd filed Critical Akechi Ceramics Co Ltd
Publication of EP1504835A1 publication Critical patent/EP1504835A1/en
Application granted granted Critical
Publication of EP1504835B1 publication Critical patent/EP1504835B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/50—Pouring-nozzles
    • B22D41/58—Pouring-nozzles with gas injecting means
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S285/00—Pipe joints or couplings
    • Y10S285/915—Mastic

Definitions

  • This invention relates to a gas feed pipe connecting screw (hereinafter referred to as “connecting screw”) mounted to a continuous casting nozzle (hereinafter referred to as "nozzle”) formed with an axially extending ring-shaped slit substantially concentric with a nozzle bore for connecting to the nozzle a gas feed pipe blowing a gas into the slit.
  • connecting screw gas feed pipe connecting screw
  • nozzle continuous casting nozzle
  • a nozzle used in continuous casting is formed with an axially extending ring-shaped slit substantially concentric with a nozzle bore in order that inclusion adherent to an inner wall of the nozzle during continuous casting may be eliminated.
  • An inert gas such as argon gas is blown into the slit.
  • a gas feed pipe feeding the inert gas is connected to a connecting screw mounted on a side wall of the nozzle.
  • JP-2001-219252-A discloses such a connecting screw.
  • a female thread is formed so as to be continuous to a mounting hole of the nozzle side wall.
  • a male thread adapted to be into mesh engagement with the female thread has three or more spot-welded portions w projecting from an outer circumference thereof.
  • the mounting hole is filled with mortar y. The spot-welded portions are caused to engage the mortar y, whereby detent is provided as shown in FIG. 4.
  • each spot-welded portion has a lower detent strength than an integrally formed product.
  • a constant detent strength is difficult to obtain by achieving a uniform welding strength of each spot-welded portion, whereupon the detent strength differs from one product to another.
  • the spot-welded portions would be broken due to high temperature, vibration or the like, so that the connecting screw would fall off from the nozzle.
  • a nut having a detent structure is proposed. However, the nut cannot be manufactured readily and the cost of the nut is increased since the nut has a complicated shape.
  • GB-A-1492534 discloses a gas feed pipe connecting screw in a continuous casting novel.
  • JP 2002001498 discloses a continuous casting novel having a gas feed pipe connecting screw according to the first part of claim 1.
  • an object of the present invention is to provide a connecting screw which can be manufactured readily and has a desirable detent effect.
  • the present invention provides a continuous casting nozzle according to claim 1.
  • the flange adapted to be fitted into the mounting hole is formed with the detent corner which engages the mortar filling the mounting hole after the flange is fitted into the mounting hole, thereby providing detent.
  • the connecting screw can be manufactured readily since the flange is formed integrally with the screw body by forging or the like. Furthermore, the connecting screw with high detent performance can be provided at low costs.
  • the flange has a polygonal plane with apexes and the apexes serve as the detent corners. Consequently, the detent performance is further improved since the engagement with the mortar is intensified.
  • the detent corner is inscribed in the mounting hole. Consequently, the detent performance is further improved by friction between the detent corners and the inner circumferential face of the mounting hole.
  • FIG. 1 a nozzle 11 to which a connecting screw 1 of the embodiment is mounted is shown.
  • the nozzle 11 has a nozzle bore 12 and an axially extending ring-shaped slit 13 substantially concentric with the nozzle bore 12.
  • the nozzle 11 further has a mounting hole 14 formed in a side wall thereof.
  • the mounting hole 14 communicates with the slit 13.
  • the mounting hole 14 includes a fitting hole 15 into which a flange 3 of the connecting screw 1 is fitted and a female thread 16 formed so as to be continuous to the fitting hole 15.
  • the connecting screw 1 includes a male thread 6 engaging the female thread 16.
  • a flange 3 having a hexagonal planar shape is formed integrally with a screw body 2 by forging or the like.
  • the screw body 2 has a centrally located gas feed hole 4 formed therethrough.
  • the gas feed hole 4 is formed with a female thread 5 for connecting a gas feed pipe.
  • the screw body 2 further has a male thread 6 formed on an outer circumferential face thereof.
  • the hexagonal flange 3 has six apexes serving as detent corners 3a respectively.
  • the detent corners 3a are inscribed on the fitting hole 15 of the mounting hole 14 as shown in FIG. 3 .
  • the connecting screw 1 is mounted to the mounting hole 14. Gaps are defined between the flange 3 and the inner circumferential face of the fitting hole 15. The gaps are filled with refractory mortar 17.
  • a gas feed pipe 18 is connected to the female thread 5 so that an inert gas such as argon gas is fed to the slit 13 of the nozzle 11 during the continuous casting.
  • TABLE 1 shows comparison between the strength (torque value (kg/cm 2 ) of the connecting screw 1 thus constructed and the strength of a conventional connecting screw s as shown in FIG. 4.
  • an average strength is 500 kg/cm 2 at room temperature and 327 kg/cm 2 at 1,000°C.
  • the above-described connecting screw 1 has an average strength of 1,220 kg/cm 2 at a room temperature and 737 kg/cm 2 at 1,000°C.
  • the values in the connecting screw 1 are twice as large as those in the conventional connecting screw s or more.
  • the connecting screw 1 of the embodiment includes the flange 3 fitted into the fitting hole 15 of the mounting hole 14.
  • the flange 3 has the hexagonal planar shape.
  • the flange 3 engages the refractory mortar 17 filling the fitting hole 15 after the flange 3 has been fitted into the fitting hole 15, thereby providing detent. Since the flange 3 is formed integrally with the screw body 2 by the forging or the like, the connecting screw 1 can be manufactured readily. Furthermore, the connecting screw 1 with high detent performance can be provided at low costs.
  • the plane of the flange 3 should not be limited to the hexagonal shape.
  • the plane of the flange 3 may be triangular, square or otherwise polygonal in shape, instead.
  • Each apex of the polygonal flange 3 serves as the detent corner 3a. Additionally, since the detent corners 3a are inscribed on the fitting hole 15 of the mounting hole 14, the detent performance can further be improved by friction between detent corners 3a and the inner circumferential face of the fitting hole 15.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Gas Burners (AREA)
  • Non-Disconnectible Joints And Screw-Threaded Joints (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
EP04018284A 2003-08-05 2004-08-02 Gas feed pipe connecting screw for continuous casting nozzle Expired - Lifetime EP1504835B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2003286348 2003-08-05
JP2003286348A JP3727632B2 (ja) 2003-08-05 2003-08-05 連続鋳造用ノズルのガス供給管接続用ネジ

Publications (2)

Publication Number Publication Date
EP1504835A1 EP1504835A1 (en) 2005-02-09
EP1504835B1 true EP1504835B1 (en) 2009-04-22

Family

ID=33550004

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04018284A Expired - Lifetime EP1504835B1 (en) 2003-08-05 2004-08-02 Gas feed pipe connecting screw for continuous casting nozzle

Country Status (9)

Country Link
US (1) US7234731B2 (zh)
EP (1) EP1504835B1 (zh)
JP (1) JP3727632B2 (zh)
KR (1) KR20050016179A (zh)
AT (1) ATE429300T1 (zh)
AU (1) AU2004203259B2 (zh)
CA (1) CA2475483C (zh)
DE (1) DE602004020713D1 (zh)
TW (1) TWI318146B (zh)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5315121B2 (ja) * 2009-04-27 2013-10-16 明智セラミックス株式会社 連続鋳造用ノズルおよび連続鋳造用ノズルにおけるガス供給管接続用ネジの固定方法
US11213886B2 (en) * 2017-09-28 2022-01-04 Krosakiharima Corporation Socket installation structure of refractory article

Family Cites Families (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US424690A (en) * 1890-04-01 Jonas a
US247273A (en) * 1881-09-20 Drain-pipe connection and plug for baths
US1304414A (en) * 1919-05-20 Boiler-tube connection
US1463692A (en) * 1923-07-31 Invisible pipe joint
US911225A (en) * 1907-12-07 1909-02-02 John H Flach Air-inlet and beer-outlet bung-hole apparatus.
US1245088A (en) * 1914-06-01 1917-10-30 Emil Christensen Tapping device.
US2397367A (en) * 1944-03-20 1946-03-26 Orzel Francis John Spark plug and mounting therefor
US2452262A (en) * 1944-12-18 1948-10-26 Rosan Joseph Fluid seal for inserts
US2780092A (en) * 1953-11-12 1957-02-05 Baldwin Lima Hamilton Corp Tube testing device
US2782806A (en) * 1954-02-17 1957-02-26 Union Carbide & Carbon Corp Reinforced pipe joint
US2926935A (en) * 1957-03-26 1960-03-01 Aeroquip Corp Adjustable boss fitting
US3112127A (en) * 1960-06-06 1963-11-26 L & L Mfg Company Fluid pressure tube fitting
US3462539A (en) * 1966-07-15 1969-08-19 Jerrold Electronics Corp Ground bushing
US3756628A (en) * 1972-03-23 1973-09-04 Textron Inc Threaded connection
US3981061A (en) * 1974-09-26 1976-09-21 Gulf & Western Manufacturing Company Method for joining pipes
GB1492534A (en) * 1974-11-04 1977-11-23 Flogates Ltd Pouring of metals
JPS55114449A (en) * 1979-02-27 1980-09-03 Toshiba Ceramics Co Ltd Gas blowing type immersion nozzle
US5085536A (en) * 1986-05-15 1992-02-04 Union Carbide Industrial Gases Technology Corp. Strengthened graphite-metal threaded connection
US4694513A (en) * 1987-01-22 1987-09-22 Kiziah Floyd G Drain
DE3735546A1 (de) * 1987-10-21 1989-05-03 Didier Werke Ag Anordnung zum verbinden eines metallteils mit einem formkoerper aus feuerfestmaterial
US4879771A (en) * 1988-02-29 1989-11-14 James Piskula Floor clean-out assembly
JPH02217145A (ja) * 1989-02-16 1990-08-29 Sumitomo Metal Ind Ltd 連続鋳造丸鋳片の表面疵防止方法及び浸漬ノズル
US5449207A (en) * 1989-09-27 1995-09-12 Sandroid Systems Pipe coupling
JP4101986B2 (ja) * 1999-09-17 2008-06-18 黒崎播磨株式会社 鋳造用ノズルへのソケットの取り付け方法
JP2001219252A (ja) * 2000-02-07 2001-08-14 Akechi Ceramics Co Ltd ガス吹き込み可能な連続鋳造用ノズル
JP3299534B2 (ja) * 2000-06-20 2002-07-08 黒崎播磨株式会社 ガス吹き連続鋳造用耐火物のソケット取り付け構造
DE20211333U1 (de) * 2002-07-26 2002-09-19 Anton Hummel Verwaltungs Gmbh, 79183 Waldkirch Klemmverschraubung mit einer Schraubhülse, einer Gegenhülse und einem Klemmeinsatz

Also Published As

Publication number Publication date
ATE429300T1 (de) 2009-05-15
DE602004020713D1 (de) 2009-06-04
AU2004203259B2 (en) 2010-01-28
AU2004203259A1 (en) 2005-02-24
US7234731B2 (en) 2007-06-26
KR20050016179A (ko) 2005-02-21
JP2005052866A (ja) 2005-03-03
TW200507965A (en) 2005-03-01
US20050040651A1 (en) 2005-02-24
JP3727632B2 (ja) 2005-12-14
TWI318146B (en) 2009-12-11
CA2475483A1 (en) 2005-02-05
CA2475483C (en) 2010-02-02
EP1504835A1 (en) 2005-02-09

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